New computer

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Good post by Acies, also if you think building a computer is way above your head or you feel insecure about it, I recommend just trying it out. It's much easier than you'd think, especially if you have the motherboard manual. It will take about 30-60 minutes of careful inspection, reading the manual and trial and error (hopefully no errors - the stakes are high) and after that you will practically become an expert on building computers, because it's really simple once you figure it out.

If you absolutely are not willing to do that, you can still take Acies' advice - just go to a computer store and ask for all of the individual parts you selected, and then ask if they can put it together. Over here, they will actually create a custom deal for you if you buy a "new computer", which includes free installment. Should be similar over in Denmark.

EDIT: But be careful to "ground" yourself before you touch anything inside your computer, which means releasing any build up of static energy within your body. If it discharges while you are working on your computer you can fuck up your hardware. Just touch something that conducts electricity well; something made of metal being an ideal choice.